Locking device for a telescopic tube
A locking device for a telescopic tube includes a knob, a connecting rod partially received in the knob and an actuated rod partially and movably received in the connecting rod and connected to the knob. The knob is used to longitudinally drive the actuated rod when adjusting the total length of the telescopic tube.
1. Field of the Invention
The present invention relates to a locking device, and more particularly to a locking device for a telescopic tube.
2. Description of Related Art
A conventional locking device for a telescopic tube in accordance with the prior art shown in
The user needs to pull the knob (50) with one hand to make the actuated rod (70) be disengaged from the inner tube (41) and pull/push the inner tube (41) to adjust the total length of the telescopic tube. However, it is difficult to only use one hand to control the inner tube (41) when a heavy object is hung on the inner tube (41). As a result, the inner tube (41) may be suddenly and quickly moved relative to the outer tube (40). It is very dangerous.
The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional locking device for a telescopic tube.
SUMMARY OF THE INVENTIONThe main objective of the present invention is to provide an improved locking device for a telescopic tube, which can be temporarily positioned to make the user adjust the telescopic tube under a safe condition.
To achieve the objective, the locking device in accordance with the present invention comprises includes a knob, a connecting rod partially received in the knob and an actuated rod partially and movably received in the connecting rod and connected to the knob. The knob is used to longitudinally drive the actuated rod when adjusting the total length of the telescopic tube. The knob has a non-round hole centrally and longitudinally defined therein. The connecting rod has a connecting section movably received in the non-round hole. The connecting section has a cross-section corresponding to that of the non-round hole such that the knob and the actuated rod can not automatically back to the original position because the bottom of the knob engaged to the distal edge of the connecting rod such that the user can use two hands to pull/push the inner tube of the telescopic tube to adjust the total length of the telescopic tube under a safe condition.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring to the drawings and initially to
The knob (10) includes a non-round hole (11) centrally and longitudinally defined therein and a bolt (12) longitudinally extending into the non-round hole (11).
The connecting rod (20) has a connecting Section (21) movably received in the non-round hole (11) and a threaded section (22) formed opposite to the connecting section (21). The connecting section (21) has a cross-section corresponding to that of the non-round hole (11). A through hole (23) is longitudinally defined in the connecting rod (20), and a shoulder (24) inward extending from an inner periphery of the through hole (23) and corresponding to a distal end of the connecting section (21) of the actuated rod (20).
The actuated rod (30) is partially and reciprocally movably received in the through hole (23) and the bolt (22) is longitudinally screwed into a threaded hole (32) that is defined in one end of the actuated rod (30) for connecting the knob (10) and the actuated rod (30). An annular protrusion (31) is laterally extending from the actuated rod (70) and selectively abuts an outer periphery of an outer tube (40) of the telescopic tube to prevent the actuated rod (30) from overly extending into the outer tube (40). A spring (33) is compressively sleeved on the actuated rod (30). The spring (33) has two opposite ends respectively abut against the annular protrusion (31) and the shoulder (24) on the inner periphery of the through hole (23).
With reference to
As described above, the hole (11) in the knob (10) is non-round such that the knob (10) and the actuated rod (30) can not automatically back to the original position when the non-round hole (11) does not correspond to the connecting section (21) of the connecting rod (20). As a result, the inner tube (41) does not be suddenly and quickly moved relative to the outer tube (40) because the user can use two hands to pull/push the inner tube (41) to adjust the total length of the telescopic tube under a safe condition when the bottom of the knob (10) engaged to the distal edge of the connecting section (21) of the connecting rod (20) due to the restitution force of the spring (33).
Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Claims
1. A locking device for a telescopic tube, comprising:
- a knob including a non-round hole centrally and longitudinally defined therein;
- a connecting rod partially and movably received in the non-round hole in the knob and adapted to be secured on an outer of the telescopic tube, the connecting rod having a connecting section movably received in the non-round hole, the connecting section having a cross-section corresponding to that of the non-round hole, a through hole longitudinally defined in the connecting rod, and a shoulder inward extending from an inner periphery of the through hole and corresponding to a distal end of the connecting section of the actuated rod; and
- an actuated rod partially and reciprocally movably received in the through hole in the connecting rod, and connected to the knob, the actuated rod including an annular protrusion laterally extending from the actuated rod and selectively abuts an outer periphery of the outer tube of the telescopic tube to prevent the actuated rod from overly extending into the outer tube, and a spring compressively sleeved on the actuated rod, the spring having two opposite ends respectively abut against the annular protrusion and the shoulder on the inner periphery of the through hole.
2. The locking device as claimed in claim 1, wherein the actuated has a threaded hole defined in one end thereof and a bolt longitudinally extends through the knob and screwed into the threaded hole to connect the knob and the actuated rod.
3. The locking device as claimed in claim 1, wherein the connecting rod has a threaded section formed thereon opposite to the connecting section, the threaded section adapted to be screwed into a skirt, which perpendicularly extending from the outer periphery of the outer tube, to hold the locking device in place.
4. The locking device as claimed in claim 2, wherein the connecting rod has a threaded section formed thereon opposite to the connecting section, the threaded section adapted to be screwed into a skirt, which perpendicularly extending from the outer periphery of the outer tube, to hold the locking device in place.
Type: Application
Filed: Jul 1, 2005
Publication Date: Jan 4, 2007
Inventor: Shu-Mei Wang (Dajia Township)
Application Number: 11/173,104
International Classification: F16B 7/10 (20060101);